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Department of Mineralogy and Petrology
Faculty of Natural Sciences
Comenius University in Bratislava

Category: Pyroclastic

Type

Commons

Name origin

Locality

GPS: 38° 24' 22,1" N, 14° 57' 27,5" E

Major minerals

Accessory minerals

Classification

- Macro - Classification

Colour

Structure

Granularity

Texture

Alterations

Petrographic characteristics

Usage

Literature

Photomicrographs

- Micro 1 - Micro 2 - Micro 3 - Micro 4

Normative composition

Step of calculation
Normative minerals



SiO2
TiO2
ZrO2
Al2O3
Fe2O3
FeO
MnO
MgO
CaO
Na2O
K2O
P2O5
F
S
CO2

Total
Molar proportion of normative mineral
Molecular mass of normative mineral
Weight % of normative mineral



Oxide
(wt. %)
56.63
0.59

16.77
3.38
3.80
0.14
2.43
5.36
3.80
5.27
0.37




98.54



Molecular
weight
60.08
79.88

101.96
159.69
71.85
70.94
40.31
56.08
61.98
94.20
141.95








Molecular
proportion
0.9426
0.0074

0.1645
0.0212
0.0549
0.0020
0.0603
0.0956
0.0613
0.0559
0.0026





1
ap











0.0087


0.0026





0.0026
328.68
0.86
4
il




0.0074



0.0074











0.0074
151.75
1.12
8
or



0.3357


0.0559






0.0559






0.0559
556.67
31.14
9
ab



0.3679


0.0613





0.0613







0.0613
524.46
32.15
10
an



0.0944


0.0472




0.0472








0.0472
278.21
13.14
13
mt







0.0212
0.0212











0.0212
231.54
4.90
14
zvyšky








0.0263

0.0603
0.0397










15
di



0.0793




0.0121

0.0276
0.0397








0.0397
226.14
8.97
17
hy



0.0469




0.0143

0.0327









0.0469
109.97
5.16
18
q



0.0183
















0.0183
60.08
1.10
Y: 0.9242
D: -0.0183
Mg/(Mg+Fe2+): 0.696
Total of normative wt. % 98.54

Comment

Chemical composition

-

SiO2
57.85TiO2
0.58Al2O3
16.16Fe2O3
2.78FeO
4.37MnO
0.13MgO
2.52CaO
5.26Na2O
3.72K2O
4.85P2O5
0.30LOI
1.49Total
100.01Mg(Mg/Fe2+)
0.51A/CNK
0.77A/NK
1.42

-

SiO2
56.63TiO2
0.59Al2O3
16.77Fe2O3
3.38FeO
3.80MnO
0.14MgO
2.43CaO
5.36Na2O
3.80K2O
5.27P2O5
0.37LOI
1.44Total
99.98Mg(Mg/Fe2+)
0.53A/CNK
0.77A/NK
1.40